Divers

20-member group of divers carries the air for 15 hours of diving. 4 members of the expedition sick or wasn't came. How many hours is sufficient air to other divers?

Correct result:

x =  18.8 h

Solution:

x=20⋅1520−4=18.8 hx = \dfrac{ 20\cdot 15}{ 20-4 } = 18.8 \ \text{h}

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